The headforms are cast using the magnesium alloy AZ91-Ingot , density 1,8 Kg/liter according to the FMVSS 218 specifications , machine tooled to obtain the site for the ball joint 2,75” ( diam. 69,85mm ) and the thread M8 , to fix the clamp;

Surface finishing , polished by hand;

The tolerance on the dimensions is < 1%;

The standard weight is 2 Kg for Small size , 3,5 Kg around for the Medium size and 4,6 Kg around for the Large size , in order to reach the total mass required by the standard using a 1,5 Kg monorail drop carriage;